Method of making chuck sleeves



couronner f5- f-i-l N, 0F WOBMTEB,MASSCHUSETnASBIGNOB T0 ROCOOD f f 'i' 0F SACHUSEITS, OF WORCESTER,

ACHUSETTS, A

" CHUCK SLEEVES.

Application filed November 22, 1922. Serial No. 602,638.

To all 'whom it may concern:

Be it known that T, HJALMAR G. CARLSON, a citizen of the United States, residing at Worcester, in the county of Worcester and e State of Massachusetts, have invented a new and useful Method of Making Chuck Sleeves, of which lthe following isa specit@ ufacturing a chuck sleeve or other article o ication. This invention relates toa method of mana similar shape' from wrought or sheet metal.v

The prlncipal objects of the invention are to provide an improved method Aof making E@ the tapered or jaw end-of thechuck sleeve Ling the necessity of linis s. 2@ plunger to closed cup-shaped'tube to provide "the open end of the chuck sleeve at the threaded end.

2531 have found that it is not necessary lto use I 'made much more simply y ee 1 the dies are performed up a ieg? e 1g. 5 1s a sectional a taper ended'plunger to sha e the internal conicalsurface of a chuck s eeve or article of similar nature and thatthe same can be and inexpensively without the sacrifice of accuracy by shaping it in external dies after a cup of the proper size is shaped u and T also find that the A closed end of t e cup can be opened by unching out the bottom, as distinguished rom cuttin 0E the end of Vthe cu .and then'A having-to ish up'v thorough e ges ofthe same. f

1 is a side view partly in section showing the rststep of the process of manufacture; j

Fi 2, 3 and 4 are similar views shownext three steps; v view of a pair of dies for receiving the blank shown 1n Fig. 4 and further modifying it; Y

Fig. 6 is a side view partly the article completed as far as ,dies is concerned; and Fi 'Z' is a similar view of .the product showing it after the operations outside o on it.

E have shown the invention as applied to the manufacture of a chuck sleeve for bit in section of the work in braces but it will be understood that it ha l capable f This is desirable to of use for other articles of a similar shape. The completechuck sleeve is illustrated in Fig. 7. In order to make it T cut out a round piece of wrought or sheet metal and draw it out in a pair of dies to a form represented in Fig. 1. Then, by a series of drawing operations which are well known in this art, I proceed to form it into external shapes, shown in Figs. 2, 3 and 4 successively.

f At some intermediate step in this series of operationsvll form one of the cu -shaped blanks, as for example the one Is own in Fig. 3, by means of an insideplunger hav- .ing a right angle shoulder |near the end of the same so as to form a square shoulder 10 on the blank 11.l This provides an internaldiameter at 12 materially larger than the internal diameter at 13 constituting the main part of the blank at that point. At the same time anouter shoulder 14' is provided b means of the, outer die in a way that wil be obvious. \I have shown this stop as vtaken at the t 'rd operation but it will be understood that the number f operations between the original flat circular disc and the cup-shape blank shown in Fig. 4 may be' more or less than those illustrated andy that the shoulder may be formed at some other stage in the operation without departing from the scope of this invention, as

expressed in the claims. It is sucient that this be done at a convenient stagle 1n the opshou der 10 will succeed it.

' In order to open the end of the tube, l merely punch out the fiat bottom at 15, as indicated in Fig. 4. This can be done in addition to, or as a part of, one of the die reducing operations and avoids the necessity of cutting o the tube and throwing away a large part 'of the metal. Tn this way the only lpart that is thrown away as waste lis the thin small disc cut out of the bottom. It will vbe observed that as the process oss on, as so far described, the bottom en of the blank is thinned out so that finally the art thatiis punched through is quite thin. secure thev necessary strength'at' the conical end of the finished article and also reduces the waste.

Theiblank shown inF-ig; is then transerred to a set of external' dies, as indicated place this blank in two external dies 16 and 17 Without any internal core and 'force fthe dies together so as to force the blank into them to fit the exterior of it, thus reducing the diameter at the bottom and forming the cone 18 at the top. The shoulder or'rather the depression which forms the shoulder permits this operation to take place Without the expense of anvinternal plunger as it furnishes a line about which the wall 18 of the blank can be bent by the external die 17 without distorting the blank and without the use of anything inside it-to keep the shape of the inner surface. This cone is shaped conveniently on account of the shoulder l0 above described having normally a littlew thicker metal at the bottom than at the topi-@This permits the end to be drawn in to form a true cone on the outer surface without distorting the inner surface and the device is finished at that end by this operation. In this figure the other part of 4the article, that shown there at the bottom, is only partially finished, the lower end 19 being forced into the .die and thereby comvthe surface at 22 inside.

pressed inwardly. In the next operation this part is further reduced by a dra-Wing die to form the blank shown in Fig. 6 which is the linished blank so far as the drawing operations are concerned. The rest ofthel operations to be performed on it are the metal finishing operations, such as knurling at the points 20 and 21, and screw threading But it will be understood that these metal finishing operations are' performed or not, or any others substituted for them, to produce any particular article.

It will be observed that the shoulder 10 is a very` important feature 4as it permits of the formation of the cone 18'without the use' of an internal conical die which could not be used. in a'blank of the shape shown in that figure because it could not be drawn out through the contracted lower end. This permits such a blank to be made and used in the process and enables me to form the other end by punching out the bottom at 15 instead of cutting it off. Thus only a small amount of metal is wasted. By the two subsequent steps, shown in Fig. 5 and indicated in Fig. 6, the smooth surface which is left by punching out the bottom is converted into the chamfered open end which may be iinished or not in accordance with the use to which the article is to be put.

Although I have illustrated and described the formation of a specific article and a definite series of steps for making it, I am aware of the fact that the invention can be carried out 'for Ithe production of other articles and the number 'of steps can be increased or decreased or otherwise varied by anyone the interior of said blank .at

Therefore, I do not wish to be limited to the particular article shown or to the specific number and order of steps illustra-ted, but what I do claim is 1. The method of making a hollow metal article having an open tapered end which consists in forming a tubular blank, forming an internal sharp shoulder near said open end, and then longitudinally compressing the metal blank in hollow dies, one of which has a conical cavity therein to bend inwardly the open end about said shoulder as a center.

2. The method of making a hollow metal article which consists in performing a series of drawing operations on a blank of sheet metal to rovide a cup shaped blank having a cylindrical wallI open at one end, shaping the open end to provide a cylindrical surface having a flat shoulder at itsouter end and a cylindrical surface beyond it in the blank of a smaller diameter concentric therewith and vterminating at the shoulder, and then forcing in the open end of the blank in a hollow external die to bend it at the shoulder and to form it into conical shape, whereby the conical lopen end is provided without using a plunger or core o the same shape.

3. The method of making a hollow metal article which consists in performing a series of drawing operations on a blank of sheet metal to provide a tubular blank having a cylindrical wall open at one end, shaping the interior of said blank at the open end to provide a cylindrical surface having a transverse flat shoulder at its outer end and a .cylindrical surface beyond'it of a smaller straighten out the walls at the end adjacent to the part previously punched out.

4.' The method of making a chuck sleeve which consists in drawing out a blank of sheet metal to rovide a cup-shaped blank having a cylinfliical wall open at one end, shaping the interior of said blank at the open end to provide a' cylindrical surface having a fiat transverse shoulder atits outer end and a cylindrical surface beyond it of a smaller diameter, unching out the opposite closed end of the lank to form an opening Meneer therethrough smaller than the interior of' the blank, then forcing in the open end of the blank to form it into conical Shape, nav ing its base larger than the other end or the blank, drawing out the punched out end of the blank to reduce its diameter near the punched out end and commence to straighten ont the Walls adjacent to the part previously punched out, and finally drawing out the part of the lola-nk constituting the end adjacent to the part punched out to form it into a uniform cylindrical Shape Smaller than the base of the'conical end.

5 The method of making a hollow chuck l sleeve which consists in .drawing out a blank ol sheet metal to provide a cup-shaped A' blankhaving a cylindrical Wall open at one endrdrawing out the interior of said blank at the open end to provide a Shoulder at a distance from its outer end., the

opposite closed end oli the lolanln punching said closed end out to forni an opening therethrough smaller than the interior ci? the blank, forcing in the open end ci the blank to forni it into conical shape, reducing the punched out end of the blank, drawing out the part of the blank constituting the end adjacent to the part punched out to form. it into a uniform cylindrical Snape, and screw threading tlic interior of said cylindrical surface to `Iform threads for tne spindle of a bit brace.

lin testimony Whereo have hereunto xed my signature.

HJ' G. CARLSN. 

